Do I have to uninstall ZA Pro version 70.337.000 before installing the latest ZA Security Suite?

I currently have Zonealarm Pro which expires in 114 days. I plan to purchase Zonealarm Security Suite to replace both Zonealarm Pro &amp; Norton Antivirus so I can use one subscription instead of having to pay for two of them. After uninstalling Norton (&amp; rebooting) do I need to also uninstall Zonealarm Pro or can I just install Zonealarm Security Suite without first ininstalling ZA?
Can you run 7.1 on Win XP or is it only for Vista?